linux-kernel - [PATCH RFC v4 0/4] spmi: pmic-arb: Add support for multiple buses

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Date: Tue, 20 Feb 2024 14:59:20 +0200
From: Abel Vesa <abel.vesa@...aro.org>
To: Stephen Boyd <sboyd@...nel.org>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konrad.dybcio@...aro.org>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
 Neil Armstrong <neil.armstrong@...aro.org>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: Srini Kandagatla <srinivas.kandagatla@...aro.org>, 
 Johan Hovold <johan@...nel.org>, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-arm-msm@...r.kernel.org, 
 linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org, 
 Abel Vesa <abel.vesa@...aro.org>
Subject: [PATCH RFC v4 0/4] spmi: pmic-arb: Add support for multiple buses

This RFC prepares for and adds support for 2 buses, which is supported
in HW starting with version 7. Until now, none of the currently
supported platforms in upstream have used the second bus. The X1E80100
platform, on the other hand, needs the second bus for the USB2.0 to work
as there are 3 SMB2360 PMICs which provide eUSB2 repeaters and they are
all found on the second bus.

Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
---
Changes in v4:
- Fixed comment above pmic_arb_init_apid_v7 by dropping the extra "bus" word
- Swicthed to devm_platform_ioremap_resource_byname for obsrvr and chnls.
  The core remains with platform_get_resource_byname as we need the core size.
- Dropped comment from probe related to the need of platform_get_resource_byname
  as it not true anymore.
- Dropped the qcom,bus-id optional property.
- Link to v3: https://lore.kernel.org/r/20240214-spmi-multi-master-support-v3-0-0bae0ef04faf@linaro.org

Changes in v3:
- Split the change into 3 separate patches. First 2 patches are moving
  apid init and core resources into version specific ops. Third one is
  adding the support for 2 buses and dedicated compatible.
- Added separate bindings patch
- Link to v2: https://lore.kernel.org/r/20240213-spmi-multi-master-support-v2-1-b3b102326906@linaro.org

Changes in v2:
- Reworked it so that it registers a spmi controller for each bus
  rather than relying on the generic framework to pass on the bus
  (master) id.
- Link to v1: https://lore.kernel.org/r/20240207-spmi-multi-master-support-v1-0-ce57f301c7fd@linaro.org

---
Abel Vesa (4):
      dt-bindings: spmi: Add PMIC ARB v7 schema
      spmi: pmic-arb: Make the APID init a version operation
      spmi: pmic-arb: Make core resources acquiring a version operation
      spmi: pmic-arb: Add multi bus support

 .../bindings/spmi/qcom,spmi-pmic-arb-v7.yaml       | 119 +++
 drivers/spmi/spmi-pmic-arb.c                       | 951 +++++++++++++--------
 2 files changed, 700 insertions(+), 370 deletions(-)
---
base-commit: 2d5c7b7eb345249cb34d42cbc2b97b4c57ea944e
change-id: 20240207-spmi-multi-master-support-832a704b779b

Best regards,
-- 
Abel Vesa <abel.vesa@...aro.org>